Answer:
C. Individuals may post private identifiable information about themselves on-line without intending it to be public and available to researchers
Step-by-step explanation:
In on-line research, the target subject or audience is hidden and unknown. Whatever the information an individual provides contains risk since he or she could offer such sensitive or private information in the hope that the information offered remains in private domain. Such personal information can be erroneous, misleading and distorted, which are potential risks for the researcher.